Serta Killner Gel Memory Foam Mattress, California King The Serta perfect sleeper is the only official mattress of the national sleep foundation (NSF), designed to help address 5 common sleep problems Cool action gel memory foam: in perfect sleepers for the first time, this revolutionary foam delivers pressure relief while reducing heat build-up Custom support system: a durable, yet flexible all-foam support system is engineered to provide the right amount of support across the entire body Cal king mattress only; california king foundation requires two pieces and is purchased separately; See options for flat or adjustable foundations by Serta Measures 83.5 Inches long by 72 inches wide by 10 inches high; 10 year manufacturer warranty